Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff2e12d206ecd63d…

MALICIOUS

PDF

92.2 KB Created: 2021-07-30 16:33:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: dff1de97fd514b8b28586723d0b4b076 SHA-1: 5c8b5a4f6325e2faed88ddb6c86a2b7f8cd51928 SHA-256: ff2e12d206ecd63d74b7f6ec3bd449bb023b2d1aecd0fdb77bef5336a6139067
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, likely intended to trick users into downloading malicious files. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics, along with numerous unknown URLs, strongly suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • AcroForm button with action trigger low PDF_ACROFORM_BUTTON
    PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://euinsuti.ro/app/webroot/files/userfiles/files/25827831400.pdf In PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/d1dc52c3e0bdd5715bcc716ba98b5126/kifegamilezatodevoli.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/c3459a0ec73da967d1b56f6f8b2cc664/fodakapaz.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/gexenelixiwi.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/81426125231.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/zotubopemadirimulesutara.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/a4d737d54599568b91fcb19c18d5f9c3/taxapevubamev.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/al6ilam1as8jbo2fi7nhgpgun7/laloduwilikat.pdfIn PDF document text
    • https://tomas-music.com/contents//files/52510720656.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/lixab.pdfIn PDF document text
    • http://dostavkaturov.ru/files/file/zatilolomamekajeva.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/acf2858d6c66668bab2b17a02cec1b0f/66697007450.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/02fd7550c8fa2876cf338100b118bd85/tufifokosatepudefajop.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/6nck4lrl2jgorap114g23sb47d/50804793659.pdfIn PDF document text
    • http://mankatomnclassof71.com/clients/e/e0/e0e8961458839910853a12af65841b27/File/pedesi.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/rufigolexopozuloguduv.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/71c614403df45109656de1917e617f7e/89361680132.pdfIn PDF document text
    • https://turbooto.vn/upload/files/5882023727.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/8476fb55b19cb0cf4d8c8870e1c83541/relegoguzeluz.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/26016324568.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/gejosomu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=download+game+top+eleven+mod+unlimited+moneyPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10339 10836 bytes
SHA-256: 5551575982a00b040dbccbdbed4caa380661273ea8e8f0dcdc4678cdf8ff5d7b
font_01_sfnt_off00011c07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C07 16868 bytes
SHA-256: 9d5902f172c37b2ff7953c720962a631dca693666bfd0f5683cf788a0e87b170
font_02_sfnt_off00014806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14806 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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